Search found 4597 matches

by Jirka
Thu Feb 21, 2019 10:35 pm
Forum: Hydrus 1D
Topic: S-shape stress parameters
Replies: 1
Views: 5

Re: S-shape stress parameters

The S-Shape parameters are calculated directly from the values provided for the Threshold & Slope function of Maas [1990]. J.
by Jirka
Wed Feb 20, 2019 9:36 pm
Forum: Hydrus 1D
Topic: Oscillations in water content output with time
Replies: 4
Views: 311

Re: Oscillations in water content output with time

Indeed, HYDRUS assumes that specific storage is equal to zero and thus the hydraulic capacity for the saturated zone is equal to zero as well. I have my own version of HYDRUS-2D that can consider nonzero specific storage (and thus the hydraulic capacity for the saturated zone as well). However, I ha...
by Jirka
Wed Feb 20, 2019 8:02 am
Forum: Hydrus 1D
Topic: (inverse) Big data input on Inverse Modeling
Replies: 16
Views: 1331

Re: (inverse) Big data input on Inverse Modeling

You need to enter the “Observation Node Number”, not the FE Node Number. I would assume that this should be clear looking at any inverse problem example provided with the software. J.
by Jirka
Tue Feb 19, 2019 9:55 pm
Forum: Hydrus 1D
Topic: large no of print times are not allowed in Hydrus
Replies: 1
Views: 13

Re: large no of print times are not allowed in Hydrus

While the HYDRUS GUI allows maximum 250 Print Times, the computational module itself allows 1000 print times. Thus you can manually update the Selector.in file (continuing with the same formatting) and the run directly the computational module h1d_calc.exe. If you insist on 6000 Print Times, then yo...
by Jirka
Mon Feb 18, 2019 7:12 pm
Forum: HYDRUS (2D/3D)
Topic: flow atmospheric boundary cycle
Replies: 6
Views: 45

Re: flow atmospheric boundary cycle

I’m currently traveling in Europe and do not have time to look at your project again. However, I recall that you used the Dirichlet BC for solute transport. That is almost always a wrong selection since then you cannot control the dispersive flux, which may be directed either in or out of the domain...
by Jirka
Sun Feb 17, 2019 6:44 pm
Forum: HYDRUS (2D/3D)
Topic: flow atmospheric boundary cycle
Replies: 6
Views: 45

Re: flow atmospheric boundary cycle

Hi Naomi, You state this: " For no apparent reason, the cycle of flux from atmospheric boundary grow to two years - 730 days. The different between the two years is one order (in odd years the biggest flux is -0.03 m/day, in double years the biggest flux is -0.17 m/day)." Are you looking at the Boun...
by Jirka
Sat Feb 16, 2019 2:18 am
Forum: HYDRUS (2D/3D)
Topic: Saturated zone only problem
Replies: 1
Views: 14

Re: Saturated zone only problem

There is no need to turn anything off. When the initial conditions are given in non-negative pressure heads and the boundary conditions do not cause unsaturated conditions, the problem to be solved will be fully saturated. See all those verification examples for solute transport (e.g., Test3 through...
by Jirka
Thu Feb 14, 2019 7:19 pm
Forum: HYDRUS (2D/3D)
Topic: flow atmospheric boundary cycle
Replies: 6
Views: 45

Re: flow atmospheric boundary cycle

If you post your project, I will have a look at it. Otherwise, I have no useful comments. J.
by Jirka
Tue Feb 12, 2019 3:25 pm
Forum: HYDRUS (2D/3D)
Topic: Simulation in infiltration well
Replies: 10
Views: 85

Re: Simulation in infiltration well

I'm not involved in the distribution of the software and cannot thus answer such questions. I do not think there is. J.
by Jirka
Tue Feb 12, 2019 1:03 am
Forum: HYDRUS (2D/3D)
Topic: Simulation in infiltration well
Replies: 10
Views: 85

Re: Simulation in infiltration well

You can download all the examples that I have mentioned, as well as the demo of Version 3 of HYDRUS (so that you can view these examples). Note that we have also uploaded much more complex "Drywell" examples (https://www.pc-progress.com/en/Default.aspx?h3d2-lib-Drywell), in which we use this new spe...
by Jirka
Mon Feb 11, 2019 11:35 pm
Forum: HYDRUS (2D/3D)
Topic: Simulation in infiltration well
Replies: 10
Views: 85

Re: Simulation in infiltration well

There is an upgrade fee to upgrade from Version 2.x to Version 3.x. J.
by Jirka
Mon Feb 11, 2019 7:16 pm
Forum: HYDRUS (2D/3D)
Topic: solute transport parameters
Replies: 1
Views: 35

Re: solute transport parameters

The use of the HYDRUS software requires its users to have a certain level of knowledge of basic terms, such as molecular diffusion, dispersion, degradation, conductivity. There are standard textbooks explaining these topics (including Soil Physics with HYDRUS (https://www.pc-progress.com/en/Default....
by Jirka
Mon Feb 11, 2019 6:55 pm
Forum: Hydrus 1D
Topic: Copy of hydrus project
Replies: 2
Views: 34

Re: Copy of hydrus project

Although I think that FAQ17 was quite clear (considering that many HYDRUS users have been using this information successfully), I have nevertheless updated the text and tried to make it even more clear. J.
by Jirka
Mon Feb 11, 2019 6:43 pm
Forum: HYDRUS (2D/3D)
Topic: Simulation in infiltration well
Replies: 10
Views: 85

Re: Simulation in infiltration well

What type of boundary conditions are you using when modeling the well? Are you using the newly-implemented Reservoir BC (in Version 3 of HYDRUS (2D/3D))? See its description in Šimůnek, J., M. Šejna, and M. Th. van Genuchten, New features of the version 3 of the HYDRUS (2D/3D) computer software pack...